British Columbia has a Residential Tenancy Branch to help you understand your rights and manage disputes between tenants and landlords. You should contact them, but briefly, here is some info from their website.
Re: Standard Rent Increases
A tenant does not have to pay an increase that is higher than the amount allowed by law. Instead, the tenant can give the landlord documents showing the allowable amount or apply for dispute resolution asking for an order that the landlord comply with the law, as long as the increase wasn’t granted through dispute resolution.
The tenant may deduct from future rent any overpayment – only if the tenant has already paid an increase higher than the legal amount. The tenant should attach a note to the rent to explain the reason for not paying the amount that the landlord has asked for.
However, the landlord can increase it beyond the maximum increase for the year with your voluntary consent (additional rent increases):
To raise the rent above the maximum annual amount, the landlord must have either the tenant’s written agreement or an order from the Residential Tenancy Branch.
If the tenants agree to an additional rent increase, the landlord must issue to each tenant a Notice of Rent Increase along with a copy of their signed letter indicating their agreement to the increase. Tenants must be given three full months' notice of the increase.
Increases can happen only once per year.